I wanted to share a way to remove the window, motor and crank assy, tracks and mounting frame from the 98 Riviera door. see linked video: https://photos.app.goo.gl/LN6iT2DsLScLxaLQ8
As stated, remove cap and weatherstip, remove 4 mounting bolts 2 front 2 rear and remove forward mounting bracket. Then slide straight out the top as one assy.